| leaden(adjective, dull, weak, easy, flat) |
| nothing(adjective, dull, weak, smooth, simple) |
| ordinary(adjective, dull, simple, flat, plain) |
| pabulum(adjective, dull, weak, smooth, simple) |
| pale(adjective, dull, dark, gloomy, miserable) |
| plain(adjective, dull, weak, simple, flat) |
| pointless(adjective, dull, weak, flat, ordinary) |
| ponderous |
| prolix(adjective, flat, stupid, ordinary, dry) |
| prosy(adjective, dull, weak, simple, flat) |
| quiet(adjective, dull, flat, slow, heavy) |
| repetitious(adjective, dull, flat, ordinary, dry) |
| resigned |
| rot |
| routine(adjective, dull, quiet, simple, flat) |
| slack(adjective, dull, quiet, flat, slow) |
| sleepy(adjective, dull, quiet, slow, informal) |
| sleepyhead(adjective, dull, quiet, weak, easy) |
| slothful(adjective, dull, quiet, flat, low) |
| somnolent(adjective, dull, quiet, slow, relaxed) |